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backdoor attacks 1harmonic triggers 1parameterized quantum circuits 1quantum neural networks 1security 1

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quant-ph2026

HarmQ: Harmonic Backdoor Attacks Against Quantum Neural Networks

Junrui Zhang, Zemin Chen, Chunsheng Xin +2

The paper proposes HarmQ, a backdoor attack for quantum neural networks that embeds low‑frequency sinusoidal (harmonic) triggers compatible with the Fourier bias of parameterized q…